Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (2): 31-46.doi: 10.12108/yxyqc.20230204

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Hydrocarbon accumulation law and model of Cretaceous clastic rocks in western Tabei uplift

XU Zhuang1,2, SHI Wanzhong3, WANG Ren3, LUO Fusong4, XIA Yongtao4, QIN Shuo3, ZHANG Xiao3   

  1. 1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China;
    2. School of Earth Sciences, East China University of Technology, Nanchang 330013, China;
    3. Faculty of Earth Resources, China University of Geosciences(Wuhan), Wuhan 430074, China;
    4. Research Institute of Exploration and Production, Sinopec Northwest Oilfield Company, Urumqi 830011, China
  • Received:2022-04-19 Revised:2022-06-25 Online:2023-03-01 Published:2023-03-07

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Abstract: Based on core observation and physical property, geochemical analysis and 3D seismic data, through sedimentary facies analysis of single well and well-tie profile, fine seismic interpretation and identification of dominant sand bodies, the hydrocarbon accumulation law and model of Cretaceous clastic rocks in western Tabei uplift were studied from the aspects of oil source, oil and gas charging characteristics, transport system and reservoircap assemblage. The results show that:(1) The Cretaceous oil and gas in the study area has the characteristics of terrigenous origin. The oil mainly comes from Triassic lacustrine source rocks in Kuqa Depression, the gas mainly comes from Jurassic coal-measure source rocks in Kuqa Sag, while the deep Triassic marine source rocks contribute a little to oil and gas.(2) The Cretaceous oil and gas charging in the study area lasted for a long time, and the accumulation period was late. The accumulation can be divided into two phases:oil generation in the early period and gas accumulation in the late period. Oil accumulation occurred in the Miocene(4.0-22.0 Ma), and gas accumulation occurred in the early Pleistocene(3.5-11.0 Ma). Affected by the structural uplift of 2.6-3.5 Ma, the gas reservoir maturity was low.(3) The oil and gas transport system in the study area is well developed. Faults and unconformities are used as the main migration channels in southern Tianshan Mountains. The unconformity surface and thin sand bodies of Baxigai Formation are the migration channels in Shunbei area.(4) The reservoirs in the study area are mainly developed in Shushanhe Formation and Baxigai Formation, with sand content generally higher than 60%, which constitute a good reservoir-cap assemblage with the continuous mudstone developed in the upper part. The distribution of high-quality reservoirs is controlled by sedimentary facies. The high-quality reservoirs in southern Tianshan Mountains are mainly distributed in the front sand bar and beach-bar of fan delta, while the high-quality reservoirs in Shunbei area are mainly distributed in front lobe of braided river delta. At present, the exploration wells are not at the highest part of the lobe, and the oil and gas shows are relatively poor. the reservoir properties in Shunbei area are better.(5) Due to different fault activities and reservoir-cap assemblages, there are obvious differences in the types of oil and gas reservoirs between southern Tianshan Mountains and Shunbei area. The oil and gas reservoirs in southern Tianshan Mountains are mainly low-amplitude structural and structural-lithologic composite reservoirs. The oil and gas reservoirs in Shunbei area are mainly lithologic reservoirs with small scale.

Key words: accumulation model, continental source rock, braided river delta, tectonic-lithologic trap, clastic reservoir, Lower Cretaceous, southern Tianshan Mountains, Shunbei area, Kuqa Depression, western Tabei uplift

CLC Number: 

  • TE122.1
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